Many businesses have windows that can only be washed from outside and using equipment such as lifts etc can be cost prohibitive. An innovative solution is the use of high pressure pole washing to clean difficult to reach windows.
The advantages of this approach is that it’s a lot safer, not involving abseiling or people having to reach out of windows and can be a lot cheaper with often only one man needed for the job. (Please note if someone is having to reach out of a window to clean it they should always be securely tethered to an eye bolt for safety.)
Whenever undertaking this kind of work its important to alert members of the public to the work through appropriate signage warning of the potential trip hazard etc.